2010 Kia Sorrento windscreen washer jet issue

[Davera]

My 2010 Kia Sorrento washer jet has stopped working.

I've replaced the pump and now the rear jet works, but I don't the only thing that happens when I try and use the front jets is the wind screen wipers move.
When the rear jets are in use you can hear the pump working but you can't hear that sound for the front.

Any ideas what could be causing the issue?